Vaadin Dialog draggable over Text-Fields

I got a problem with the Vaadin dialog component. I would like the user to drag the dialog, setDraggable(true) does the job.
The only problem is if the dialog contains a text field or RichTextEditor, and the user tries to select a piece of text with the mouse, the dialog gets dragged instead of the text being selected.
Is there any way to disable this, so that dialog-DnD only occurs outside of text fields?

Thanks in advance,

Maybe you could add a pair of focus and blur listeners that disable draggable when the TextField is focused and re-enable it when the TextField is blurred?